How'd they do that?
 

http://standards.ieee.org/regauth/oui/index.shtml
 
 

OUI
00-00-0C   (hex)

Organization
CISCO SYSTEMS, INC.

company_id
00000C  (base 16)

Organization Address
CISCO SYSTEMS, INC.
170 WEST TASMAN DRIVE
SAN JOSE  CA  95134-1706
 

Excerpt of SEARCH result:

Here are the results of your search through the public section of the
IEEE Standards OUI database report for 3com:
 

00-01-02   (hex)    3COM CORPORATION
000102     (base 16)            3COM CORPORATION
                                          5400 Bayfront Plaza  - MS: 4220
                                          Santa Clara  CA  95052
 
 

00-01-03   (hex)    3COM CORPORATION
000103     (base 16)            3COM CORPORATION
                                         5400 Bayfront Plaza - MS: 4220
                                         Santa Clara  CA  95052
 

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